Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
phau thong » phap thong, phan thong, phan thuong
hanh khoa » hang khoa, anh khoa, hanh hoa
phan tong » phan trong, phan cong, han tong
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, tri thuc, dai thuc
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tai thuc hanh khoa ((((phau thong) or (khau thong))) or (phan tong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tai thuc hanh khoa ((((phau thong) OR (khau thong))) OR (phan tong))*.